2 * The low performance USB storage driver (ub).
4 * Copyright (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
5 * Copyright (C) 2004 Pete Zaitcev (zaitcev@yahoo.com)
7 * This work is a part of Linux kernel, is derived from it,
8 * and is not licensed separately. See file COPYING for details.
10 * TODO (sorted by decreasing priority)
11 * -- Kill first_open (Al Viro fixed the block layer now)
12 * -- set readonly flag for CDs, set removable flag for CF readers
13 * -- do inquiry and verify we got a disk and not a tape (for LUN mismatch)
14 * -- special case some senses, e.g. 3a/0 -> no media present, reduce retries
15 * -- verify the 13 conditions and do bulk resets
16 * -- kill last_pipe and simply do two-state clearing on both pipes
17 * -- verify protocol (bulk) from USB descriptors (maybe...)
19 * -- move top_sense and work_bcs into separate allocations (if they survive)
20 * for cache purists and esoteric architectures.
21 * -- Allocate structure for LUN 0 before the first ub_sync_tur, avoid NULL. ?
22 * -- prune comments, they are too volumnous
23 * -- Exterminate P3 printks
25 * -- Redo "benh's retries", perhaps have spin-up code to handle them. V:D=?
26 * -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring.
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/usb.h>
31 #include <linux/usb_usual.h>
32 #include <linux/blkdev.h>
33 #include <linux/devfs_fs_kernel.h>
34 #include <linux/timer.h>
35 #include <scsi/scsi.h>
38 #define DEVFS_NAME DRV_NAME
43 * The command state machine is the key model for understanding of this driver.
45 * The general rule is that all transitions are done towards the bottom
46 * of the diagram, thus preventing any loops.
48 * An exception to that is how the STAT state is handled. A counter allows it
49 * to be re-entered along the path marked with [C].
55 * ub_scsi_cmd_start fails ->--------------------------------------\
62 * was -EPIPE -->-------------------------------->! CLEAR ! !
65 * was error -->------------------------------------- ! --------->\
67 * /--<-- cmd->dir == NONE ? ! !
74 * ! was -EPIPE -->--------------->! CLR2STS ! ! !
77 * ! ! was error -->---- ! --------->\
78 * ! was error -->--------------------- ! ------------- ! --------->\
81 * \--->+--------+ ! ! !
82 * ! STAT !<--------------------------/ ! !
85 * [C] was -EPIPE -->-----------\ ! !
87 * +<---- len == 0 ! ! !
89 * ! was error -->--------------------------------------!---------->\
91 * +<---- bad CSW ! ! !
92 * +<---- bad tag ! ! !
98 * \------- ! --------------------[C]--------\ ! !
100 * cmd->error---\ +--------+ ! !
101 * ! +--------------->! SENSE !<----------/ !
102 * STAT_FAIL----/ +--------+ !
105 * \--------------------------------\--------------------->! DONE !
110 * This many LUNs per USB device.
111 * Every one of them takes a host, see UB_MAX_HOSTS.
113 #define UB_MAX_LUNS 9
118 #define UB_PARTS_PER_LUN 8
120 #define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */
122 #define UB_SENSE_SIZE 18
127 /* command block wrapper */
128 struct bulk_cb_wrap {
129 __le32 Signature; /* contains 'USBC' */
130 u32 Tag; /* unique per command id */
131 __le32 DataTransferLength; /* size of data */
132 u8 Flags; /* direction in bit 0 */
134 u8 Length; /* of of the CDB */
135 u8 CDB[UB_MAX_CDB_SIZE]; /* max command */
138 #define US_BULK_CB_WRAP_LEN 31
139 #define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */
140 #define US_BULK_FLAG_IN 1
141 #define US_BULK_FLAG_OUT 0
143 /* command status wrapper */
144 struct bulk_cs_wrap {
145 __le32 Signature; /* should = 'USBS' */
146 u32 Tag; /* same as original command */
147 __le32 Residue; /* amount not transferred */
148 u8 Status; /* see below */
151 #define US_BULK_CS_WRAP_LEN 13
152 #define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */
153 #define US_BULK_STAT_OK 0
154 #define US_BULK_STAT_FAIL 1
155 #define US_BULK_STAT_PHASE 2
157 /* bulk-only class specific requests */
158 #define US_BULK_RESET_REQUEST 0xff
159 #define US_BULK_GET_MAX_LUN 0xfe
165 #define UB_MAX_REQ_SG 9 /* cdrecord requires 32KB and maybe a header */
166 #define UB_MAX_SECTORS 64
169 * A second is more than enough for a 32K transfer (UB_MAX_SECTORS)
170 * even if a webcam hogs the bus, but some devices need time to spin up.
172 #define UB_URB_TIMEOUT (HZ*2)
173 #define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */
174 #define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */
175 #define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */
178 * An instance of a SCSI command in transit.
180 #define UB_DIR_NONE 0
181 #define UB_DIR_READ 1
182 #define UB_DIR_ILLEGAL2 2
183 #define UB_DIR_WRITE 3
185 #define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \
186 (((c)==UB_DIR_READ)? 'r': 'n'))
188 enum ub_scsi_cmd_state {
189 UB_CMDST_INIT, /* Initial state */
190 UB_CMDST_CMD, /* Command submitted */
191 UB_CMDST_DATA, /* Data phase */
192 UB_CMDST_CLR2STS, /* Clearing before requesting status */
193 UB_CMDST_STAT, /* Status phase */
194 UB_CMDST_CLEAR, /* Clearing a stall (halt, actually) */
195 UB_CMDST_CLRRS, /* Clearing before retrying status */
196 UB_CMDST_SENSE, /* Sending Request Sense */
197 UB_CMDST_DONE /* Final state */
200 static char *ub_scsi_cmd_stname[] = {
213 unsigned char cdb[UB_MAX_CDB_SIZE];
214 unsigned char cdb_len;
216 unsigned char dir; /* 0 - none, 1 - read, 3 - write. */
217 unsigned char trace_index;
218 enum ub_scsi_cmd_state state;
220 struct ub_scsi_cmd *next;
222 int error; /* Return code - valid upon done */
223 unsigned int act_len; /* Return size */
224 unsigned char key, asc, ascq; /* May be valid if error==-EIO */
226 int stat_count; /* Retries getting status. */
228 unsigned int len; /* Requested length */
229 unsigned int current_sg;
230 unsigned int nsg; /* sgv[nsg] */
231 struct scatterlist sgv[UB_MAX_REQ_SG];
234 void (*done)(struct ub_dev *, struct ub_scsi_cmd *);
240 unsigned int current_try;
241 unsigned int nsg; /* sgv[nsg] */
242 struct scatterlist sgv[UB_MAX_REQ_SG];
248 unsigned long nsec; /* Linux size - 512 byte sectors */
249 unsigned int bsize; /* Linux hardsect_size */
250 unsigned int bshift; /* Shift between 512 and hard sects */
254 * The SCSI command tracing structure.
257 #define SCMD_ST_HIST_SZ 8
258 #define SCMD_TRACE_SZ 63 /* Less than 4KB of 61-byte lines */
260 struct ub_scsi_cmd_trace {
263 unsigned int req_size, act_size;
266 unsigned char key, asc, ascq;
267 char st_hst[SCMD_ST_HIST_SZ];
270 struct ub_scsi_trace {
272 struct ub_scsi_cmd_trace vec[SCMD_TRACE_SZ];
276 * This is a direct take-off from linux/include/completion.h
277 * The difference is that I do not wait on this thing, just poll.
278 * When I want to wait (ub_probe), I just use the stock completion.
280 * Note that INIT_COMPLETION takes no lock. It is correct. But why
281 * in the bloody hell that thing takes struct instead of pointer to struct
282 * is quite beyond me. I just copied it from the stock completion.
284 struct ub_completion {
289 static inline void ub_init_completion(struct ub_completion *x)
292 spin_lock_init(&x->lock);
295 #define UB_INIT_COMPLETION(x) ((x).done = 0)
297 static void ub_complete(struct ub_completion *x)
301 spin_lock_irqsave(&x->lock, flags);
303 spin_unlock_irqrestore(&x->lock, flags);
306 static int ub_is_completed(struct ub_completion *x)
311 spin_lock_irqsave(&x->lock, flags);
313 spin_unlock_irqrestore(&x->lock, flags);
319 struct ub_scsi_cmd_queue {
321 struct ub_scsi_cmd *head, *tail;
325 * The block device instance (one per LUN).
329 struct list_head link;
330 struct gendisk *disk;
331 int id; /* Host index */
332 int num; /* LUN number */
335 int changed; /* Media was changed */
338 int first_open; /* Kludge. See ub_bd_open. */
340 struct ub_request urq;
342 /* Use Ingo's mempool if or when we have more than one command. */
344 * Currently we never need more than one command for the whole device.
345 * However, giving every LUN a command is a cheap and automatic way
346 * to enforce fairness between them.
349 struct ub_scsi_cmd cmdv[1];
351 struct ub_capacity capacity;
355 * The USB device instance.
359 atomic_t poison; /* The USB device is disconnected */
360 int openc; /* protected by ub_lock! */
361 /* kref is too implicit for our taste */
362 int reset; /* Reset is running */
365 struct usb_device *dev;
366 struct usb_interface *intf;
368 struct list_head luns;
370 unsigned int send_bulk_pipe; /* cached pipe values */
371 unsigned int recv_bulk_pipe;
372 unsigned int send_ctrl_pipe;
373 unsigned int recv_ctrl_pipe;
375 struct tasklet_struct tasklet;
377 struct ub_scsi_cmd_queue cmd_queue;
378 struct ub_scsi_cmd top_rqs_cmd; /* REQUEST SENSE */
379 unsigned char top_sense[UB_SENSE_SIZE];
381 struct ub_completion work_done;
383 struct timer_list work_timer;
384 int last_pipe; /* What might need clearing */
385 __le32 signature; /* Learned signature */
386 struct bulk_cb_wrap work_bcb;
387 struct bulk_cs_wrap work_bcs;
388 struct usb_ctrlrequest work_cr;
390 struct work_struct reset_work;
391 wait_queue_head_t reset_wait;
394 struct ub_scsi_trace tr;
399 static void ub_cleanup(struct ub_dev *sc);
400 static int ub_request_fn_1(struct ub_lun *lun, struct request *rq);
401 static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
402 struct ub_scsi_cmd *cmd, struct ub_request *urq);
403 static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
404 struct ub_scsi_cmd *cmd, struct ub_request *urq);
405 static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
406 static void ub_end_rq(struct request *rq, int uptodate);
407 static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun,
408 struct ub_request *urq, struct ub_scsi_cmd *cmd);
409 static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
410 static void ub_urb_complete(struct urb *urb, struct pt_regs *pt);
411 static void ub_scsi_action(unsigned long _dev);
412 static void ub_scsi_dispatch(struct ub_dev *sc);
413 static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
414 static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
415 static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc);
416 static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
417 static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
418 static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
419 static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
420 static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
422 static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd);
423 static void ub_reset_enter(struct ub_dev *sc);
424 static void ub_reset_task(void *arg);
425 static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun);
426 static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun,
427 struct ub_capacity *ret);
428 static int ub_probe_lun(struct ub_dev *sc, int lnum);
432 #ifdef CONFIG_USB_LIBUSUAL
434 #define ub_usb_ids storage_usb_ids
437 static struct usb_device_id ub_usb_ids[] = {
438 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) },
442 MODULE_DEVICE_TABLE(usb, ub_usb_ids);
443 #endif /* CONFIG_USB_LIBUSUAL */
446 * Find me a way to identify "next free minor" for add_disk(),
447 * and the array disappears the next day. However, the number of
448 * hosts has something to do with the naming and /proc/partitions.
449 * This has to be thought out in detail before changing.
450 * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure.
452 #define UB_MAX_HOSTS 26
453 static char ub_hostv[UB_MAX_HOSTS];
455 #define UB_QLOCK_NUM 5
456 static spinlock_t ub_qlockv[UB_QLOCK_NUM];
457 static int ub_qlock_next = 0;
459 static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */
462 * The SCSI command tracing procedures.
465 static void ub_cmdtr_new(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
468 struct ub_scsi_cmd_trace *t;
470 if ((n = sc->tr.cur + 1) == SCMD_TRACE_SZ) n = 0;
473 memset(t, 0, sizeof(struct ub_scsi_cmd_trace));
477 t->req_size = cmd->len;
478 t->st_hst[0] = cmd->state;
481 cmd->trace_index = n;
484 static void ub_cmdtr_state(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
487 struct ub_scsi_cmd_trace *t;
489 t = &sc->tr.vec[cmd->trace_index];
490 if (t->tag == cmd->tag) {
491 if ((n = t->hcur + 1) == SCMD_ST_HIST_SZ) n = 0;
492 t->st_hst[n] = cmd->state;
497 static void ub_cmdtr_act_len(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
499 struct ub_scsi_cmd_trace *t;
501 t = &sc->tr.vec[cmd->trace_index];
502 if (t->tag == cmd->tag)
503 t->act_size = cmd->act_len;
506 static void ub_cmdtr_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
507 unsigned char *sense)
509 struct ub_scsi_cmd_trace *t;
511 t = &sc->tr.vec[cmd->trace_index];
512 if (t->tag == cmd->tag) {
513 t->key = sense[2] & 0x0F;
519 static ssize_t ub_diag_show(struct device *dev, struct device_attribute *attr,
522 struct usb_interface *intf;
530 struct ub_scsi_cmd_trace *t;
532 intf = to_usb_interface(dev);
533 sc = usb_get_intfdata(intf);
538 spin_lock_irqsave(sc->lock, flags);
540 cnt += sprintf(page + cnt,
541 "poison %d reset %d\n",
542 atomic_read(&sc->poison), sc->reset);
543 cnt += sprintf(page + cnt,
545 sc->cmd_queue.qlen, sc->cmd_queue.qmax);
546 cnt += sprintf(page + cnt,
547 "sg %d %d %d %d %d .. %d\n",
555 list_for_each (p, &sc->luns) {
556 lun = list_entry(p, struct ub_lun, link);
557 cnt += sprintf(page + cnt,
558 "lun %u changed %d removable %d readonly %d\n",
559 lun->num, lun->changed, lun->removable, lun->readonly);
562 if ((nc = sc->tr.cur + 1) == SCMD_TRACE_SZ) nc = 0;
563 for (j = 0; j < SCMD_TRACE_SZ; j++) {
566 cnt += sprintf(page + cnt, "%08x %02x", t->tag, t->op);
567 if (t->op == REQUEST_SENSE) {
568 cnt += sprintf(page + cnt, " [sense %x %02x %02x]",
569 t->key, t->asc, t->ascq);
571 cnt += sprintf(page + cnt, " %c", UB_DIR_CHAR(t->dir));
572 cnt += sprintf(page + cnt, " [%5d %5d]",
573 t->req_size, t->act_size);
575 if ((nh = t->hcur + 1) == SCMD_ST_HIST_SZ) nh = 0;
576 for (i = 0; i < SCMD_ST_HIST_SZ; i++) {
577 cnt += sprintf(page + cnt, " %s",
578 ub_scsi_cmd_stname[(int)t->st_hst[nh]]);
579 if (++nh == SCMD_ST_HIST_SZ) nh = 0;
581 cnt += sprintf(page + cnt, "\n");
583 if (++nc == SCMD_TRACE_SZ) nc = 0;
586 spin_unlock_irqrestore(sc->lock, flags);
590 static DEVICE_ATTR(diag, S_IRUGO, ub_diag_show, NULL); /* N.B. World readable */
595 * This also stores the host for indexing by minor, which is somewhat dirty.
597 static int ub_id_get(void)
602 spin_lock_irqsave(&ub_lock, flags);
603 for (i = 0; i < UB_MAX_HOSTS; i++) {
604 if (ub_hostv[i] == 0) {
606 spin_unlock_irqrestore(&ub_lock, flags);
610 spin_unlock_irqrestore(&ub_lock, flags);
614 static void ub_id_put(int id)
618 if (id < 0 || id >= UB_MAX_HOSTS) {
619 printk(KERN_ERR DRV_NAME ": bad host ID %d\n", id);
623 spin_lock_irqsave(&ub_lock, flags);
624 if (ub_hostv[id] == 0) {
625 spin_unlock_irqrestore(&ub_lock, flags);
626 printk(KERN_ERR DRV_NAME ": freeing free host ID %d\n", id);
630 spin_unlock_irqrestore(&ub_lock, flags);
634 * This is necessitated by the fact that blk_cleanup_queue does not
635 * necesserily destroy the queue. Instead, it may merely decrease q->refcnt.
636 * Since our blk_init_queue() passes a spinlock common with ub_dev,
637 * we have life time issues when ub_cleanup frees ub_dev.
639 static spinlock_t *ub_next_lock(void)
644 spin_lock_irqsave(&ub_lock, flags);
645 ret = &ub_qlockv[ub_qlock_next];
646 ub_qlock_next = (ub_qlock_next + 1) % UB_QLOCK_NUM;
647 spin_unlock_irqrestore(&ub_lock, flags);
652 * Downcount for deallocation. This rides on two assumptions:
653 * - once something is poisoned, its refcount cannot grow
654 * - opens cannot happen at this time (del_gendisk was done)
655 * If the above is true, we can drop the lock, which we need for
656 * blk_cleanup_queue(): the silly thing may attempt to sleep.
657 * [Actually, it never needs to sleep for us, but it calls might_sleep()]
659 static void ub_put(struct ub_dev *sc)
663 spin_lock_irqsave(&ub_lock, flags);
665 if (sc->openc == 0 && atomic_read(&sc->poison)) {
666 spin_unlock_irqrestore(&ub_lock, flags);
669 spin_unlock_irqrestore(&ub_lock, flags);
674 * Final cleanup and deallocation.
676 static void ub_cleanup(struct ub_dev *sc)
682 while (!list_empty(&sc->luns)) {
684 lun = list_entry(p, struct ub_lun, link);
687 /* I don't think queue can be NULL. But... Stolen from sx8.c */
688 if ((q = lun->disk->queue) != NULL)
689 blk_cleanup_queue(q);
691 * If we zero disk->private_data BEFORE put_disk, we have
692 * to check for NULL all over the place in open, release,
693 * check_media and revalidate, because the block level
694 * semaphore is well inside the put_disk.
695 * But we cannot zero after the call, because *disk is gone.
696 * The sd.c is blatantly racy in this area.
698 /* disk->private_data = NULL; */
710 * The "command allocator".
712 static struct ub_scsi_cmd *ub_get_cmd(struct ub_lun *lun)
714 struct ub_scsi_cmd *ret;
723 static void ub_put_cmd(struct ub_lun *lun, struct ub_scsi_cmd *cmd)
725 if (cmd != &lun->cmdv[0]) {
726 printk(KERN_WARNING "%s: releasing a foreign cmd %p\n",
731 printk(KERN_WARNING "%s: releasing a free cmd\n", lun->name);
740 static void ub_cmdq_add(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
742 struct ub_scsi_cmd_queue *t = &sc->cmd_queue;
744 if (t->qlen++ == 0) {
752 if (t->qlen > t->qmax)
756 static void ub_cmdq_insert(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
758 struct ub_scsi_cmd_queue *t = &sc->cmd_queue;
760 if (t->qlen++ == 0) {
768 if (t->qlen > t->qmax)
772 static struct ub_scsi_cmd *ub_cmdq_pop(struct ub_dev *sc)
774 struct ub_scsi_cmd_queue *t = &sc->cmd_queue;
775 struct ub_scsi_cmd *cmd;
787 #define ub_cmdq_peek(sc) ((sc)->cmd_queue.head)
790 * The request function is our main entry point
793 static void ub_request_fn(request_queue_t *q)
795 struct ub_lun *lun = q->queuedata;
798 while ((rq = elv_next_request(q)) != NULL) {
799 if (ub_request_fn_1(lun, rq) != 0) {
806 static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
808 struct ub_dev *sc = lun->udev;
809 struct ub_scsi_cmd *cmd;
810 struct ub_request *urq;
813 if (atomic_read(&sc->poison) || lun->changed) {
814 blkdev_dequeue_request(rq);
819 if (lun->urq.rq != NULL)
821 if ((cmd = ub_get_cmd(lun)) == NULL)
823 memset(cmd, 0, sizeof(struct ub_scsi_cmd));
825 blkdev_dequeue_request(rq);
828 memset(urq, 0, sizeof(struct ub_request));
832 * get scatterlist from block layer
834 n_elem = blk_rq_map_sg(lun->disk->queue, rq, &urq->sgv[0]);
836 printk(KERN_INFO "%s: failed request map (%d)\n",
837 lun->name, n_elem); /* P3 */
840 if (n_elem > UB_MAX_REQ_SG) { /* Paranoia */
841 printk(KERN_WARNING "%s: request with %d segments\n",
846 sc->sg_stat[n_elem < 5 ? n_elem : 5]++;
848 if (blk_pc_request(rq)) {
849 ub_cmd_build_packet(sc, lun, cmd, urq);
851 ub_cmd_build_block(sc, lun, cmd, urq);
853 cmd->state = UB_CMDST_INIT;
855 cmd->done = ub_rw_cmd_done;
858 cmd->tag = sc->tagcnt++;
859 if (ub_submit_scsi(sc, cmd) != 0)
865 ub_put_cmd(lun, cmd);
870 static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
871 struct ub_scsi_cmd *cmd, struct ub_request *urq)
873 struct request *rq = urq->rq;
874 unsigned int block, nblks;
876 if (rq_data_dir(rq) == WRITE)
877 cmd->dir = UB_DIR_WRITE;
879 cmd->dir = UB_DIR_READ;
882 memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg);
887 * The call to blk_queue_hardsect_size() guarantees that request
888 * is aligned, but it is given in terms of 512 byte units, always.
890 block = rq->sector >> lun->capacity.bshift;
891 nblks = rq->nr_sectors >> lun->capacity.bshift;
893 cmd->cdb[0] = (cmd->dir == UB_DIR_READ)? READ_10: WRITE_10;
894 /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */
895 cmd->cdb[2] = block >> 24;
896 cmd->cdb[3] = block >> 16;
897 cmd->cdb[4] = block >> 8;
899 cmd->cdb[7] = nblks >> 8;
903 cmd->len = rq->nr_sectors * 512;
906 static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
907 struct ub_scsi_cmd *cmd, struct ub_request *urq)
909 struct request *rq = urq->rq;
911 if (rq->data_len == 0) {
912 cmd->dir = UB_DIR_NONE;
914 if (rq_data_dir(rq) == WRITE)
915 cmd->dir = UB_DIR_WRITE;
917 cmd->dir = UB_DIR_READ;
921 memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg);
923 memcpy(&cmd->cdb, rq->cmd, rq->cmd_len);
924 cmd->cdb_len = rq->cmd_len;
926 cmd->len = rq->data_len;
929 static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
931 struct ub_lun *lun = cmd->lun;
932 struct ub_request *urq = cmd->back;
938 if (cmd->error == 0) {
941 if (blk_pc_request(rq)) {
942 if (cmd->act_len >= rq->data_len)
945 rq->data_len -= cmd->act_len;
950 if (blk_pc_request(rq)) {
951 /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */
952 memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE);
953 rq->sense_len = UB_SENSE_SIZE;
954 if (sc->top_sense[0] != 0)
955 rq->errors = SAM_STAT_CHECK_CONDITION;
957 rq->errors = DID_ERROR << 16;
959 if (cmd->error == -EIO) {
960 if (ub_rw_cmd_retry(sc, lun, urq, cmd) == 0)
968 ub_put_cmd(lun, cmd);
969 ub_end_rq(rq, uptodate);
970 blk_start_queue(lun->disk->queue);
973 static void ub_end_rq(struct request *rq, int uptodate)
975 end_that_request_first(rq, uptodate, rq->hard_nr_sectors);
976 end_that_request_last(rq, uptodate);
979 static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun,
980 struct ub_request *urq, struct ub_scsi_cmd *cmd)
983 if (atomic_read(&sc->poison))
988 if (urq->current_try >= 3)
991 /* P3 */ printk("%s: dir %c len/act %d/%d "
992 "[sense %x %02x %02x] retry %d\n",
993 sc->name, UB_DIR_CHAR(cmd->dir), cmd->len, cmd->act_len,
994 cmd->key, cmd->asc, cmd->ascq, urq->current_try);
996 memset(cmd, 0, sizeof(struct ub_scsi_cmd));
997 ub_cmd_build_block(sc, lun, cmd, urq);
999 cmd->state = UB_CMDST_INIT;
1001 cmd->done = ub_rw_cmd_done;
1004 cmd->tag = sc->tagcnt++;
1006 #if 0 /* Wasteful */
1007 return ub_submit_scsi(sc, cmd);
1009 ub_cmdq_add(sc, cmd);
1015 * Submit a regular SCSI operation (not an auto-sense).
1017 * The Iron Law of Good Submit Routine is:
1018 * Zero return - callback is done, Nonzero return - callback is not done.
1021 * Host is assumed locked.
1023 * XXX We only support Bulk for the moment.
1025 static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
1028 if (cmd->state != UB_CMDST_INIT ||
1029 (cmd->dir != UB_DIR_NONE && cmd->len == 0)) {
1033 ub_cmdq_add(sc, cmd);
1035 * We can call ub_scsi_dispatch(sc) right away here, but it's a little
1036 * safer to jump to a tasklet, in case upper layers do something silly.
1038 tasklet_schedule(&sc->tasklet);
1043 * Submit the first URB for the queued command.
1044 * This function does not deal with queueing in any way.
1046 static int ub_scsi_cmd_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
1048 struct bulk_cb_wrap *bcb;
1051 bcb = &sc->work_bcb;
1054 * ``If the allocation length is eighteen or greater, and a device
1055 * server returns less than eithteen bytes of data, the application
1056 * client should assume that the bytes not transferred would have been
1057 * zeroes had the device server returned those bytes.''
1059 * We zero sense for all commands so that when a packet request
1060 * fails it does not return a stale sense.
1062 memset(&sc->top_sense, 0, UB_SENSE_SIZE);
1064 /* set up the command wrapper */
1065 bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
1066 bcb->Tag = cmd->tag; /* Endianness is not important */
1067 bcb->DataTransferLength = cpu_to_le32(cmd->len);
1068 bcb->Flags = (cmd->dir == UB_DIR_READ) ? 0x80 : 0;
1069 bcb->Lun = (cmd->lun != NULL) ? cmd->lun->num : 0;
1070 bcb->Length = cmd->cdb_len;
1072 /* copy the command payload */
1073 memcpy(bcb->CDB, cmd->cdb, UB_MAX_CDB_SIZE);
1075 UB_INIT_COMPLETION(sc->work_done);
1077 sc->last_pipe = sc->send_bulk_pipe;
1078 usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->send_bulk_pipe,
1079 bcb, US_BULK_CB_WRAP_LEN, ub_urb_complete, sc);
1081 /* Fill what we shouldn't be filling, because usb-storage did so. */
1082 sc->work_urb.actual_length = 0;
1083 sc->work_urb.error_count = 0;
1084 sc->work_urb.status = 0;
1086 if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) {
1087 /* XXX Clear stalls */
1088 ub_complete(&sc->work_done);
1092 sc->work_timer.expires = jiffies + UB_URB_TIMEOUT;
1093 add_timer(&sc->work_timer);
1095 cmd->state = UB_CMDST_CMD;
1096 ub_cmdtr_state(sc, cmd);
1103 static void ub_urb_timeout(unsigned long arg)
1105 struct ub_dev *sc = (struct ub_dev *) arg;
1106 unsigned long flags;
1108 spin_lock_irqsave(sc->lock, flags);
1109 if (!ub_is_completed(&sc->work_done))
1110 usb_unlink_urb(&sc->work_urb);
1111 spin_unlock_irqrestore(sc->lock, flags);
1115 * Completion routine for the work URB.
1117 * This can be called directly from usb_submit_urb (while we have
1118 * the sc->lock taken) and from an interrupt (while we do NOT have
1119 * the sc->lock taken). Therefore, bounce this off to a tasklet.
1121 static void ub_urb_complete(struct urb *urb, struct pt_regs *pt)
1123 struct ub_dev *sc = urb->context;
1125 ub_complete(&sc->work_done);
1126 tasklet_schedule(&sc->tasklet);
1129 static void ub_scsi_action(unsigned long _dev)
1131 struct ub_dev *sc = (struct ub_dev *) _dev;
1132 unsigned long flags;
1134 spin_lock_irqsave(sc->lock, flags);
1135 ub_scsi_dispatch(sc);
1136 spin_unlock_irqrestore(sc->lock, flags);
1139 static void ub_scsi_dispatch(struct ub_dev *sc)
1141 struct ub_scsi_cmd *cmd;
1144 while (!sc->reset && (cmd = ub_cmdq_peek(sc)) != NULL) {
1145 if (cmd->state == UB_CMDST_DONE) {
1147 (*cmd->done)(sc, cmd);
1148 } else if (cmd->state == UB_CMDST_INIT) {
1149 ub_cmdtr_new(sc, cmd);
1150 if ((rc = ub_scsi_cmd_start(sc, cmd)) == 0)
1153 cmd->state = UB_CMDST_DONE;
1154 ub_cmdtr_state(sc, cmd);
1156 if (!ub_is_completed(&sc->work_done))
1158 del_timer(&sc->work_timer);
1159 ub_scsi_urb_compl(sc, cmd);
1164 static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
1166 struct urb *urb = &sc->work_urb;
1167 struct bulk_cs_wrap *bcs;
1171 if (atomic_read(&sc->poison)) {
1172 ub_state_done(sc, cmd, -ENODEV);
1176 if (cmd->state == UB_CMDST_CLEAR) {
1177 if (urb->status == -EPIPE) {
1179 * STALL while clearning STALL.
1180 * The control pipe clears itself - nothing to do.
1182 printk(KERN_NOTICE "%s: stall on control pipe\n",
1188 * We ignore the result for the halt clear.
1191 /* reset the endpoint toggle */
1192 usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe),
1193 usb_pipeout(sc->last_pipe), 0);
1195 ub_state_sense(sc, cmd);
1197 } else if (cmd->state == UB_CMDST_CLR2STS) {
1198 if (urb->status == -EPIPE) {
1199 printk(KERN_NOTICE "%s: stall on control pipe\n",
1205 * We ignore the result for the halt clear.
1208 /* reset the endpoint toggle */
1209 usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe),
1210 usb_pipeout(sc->last_pipe), 0);
1212 ub_state_stat(sc, cmd);
1214 } else if (cmd->state == UB_CMDST_CLRRS) {
1215 if (urb->status == -EPIPE) {
1216 printk(KERN_NOTICE "%s: stall on control pipe\n",
1222 * We ignore the result for the halt clear.
1225 /* reset the endpoint toggle */
1226 usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe),
1227 usb_pipeout(sc->last_pipe), 0);
1229 ub_state_stat_counted(sc, cmd);
1231 } else if (cmd->state == UB_CMDST_CMD) {
1232 switch (urb->status) {
1238 rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe);
1240 printk(KERN_NOTICE "%s: "
1241 "unable to submit clear (%d)\n",
1244 * This is typically ENOMEM or some other such shit.
1245 * Retrying is pointless. Just do Bad End on it...
1247 ub_state_done(sc, cmd, rc);
1250 cmd->state = UB_CMDST_CLEAR;
1251 ub_cmdtr_state(sc, cmd);
1253 case -ESHUTDOWN: /* unplug */
1254 case -EILSEQ: /* unplug timeout on uhci */
1255 ub_state_done(sc, cmd, -ENODEV);
1260 if (urb->actual_length != US_BULK_CB_WRAP_LEN) {
1264 if (cmd->dir == UB_DIR_NONE || cmd->nsg < 1) {
1265 ub_state_stat(sc, cmd);
1269 // udelay(125); // usb-storage has this
1270 ub_data_start(sc, cmd);
1272 } else if (cmd->state == UB_CMDST_DATA) {
1273 if (urb->status == -EPIPE) {
1274 rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe);
1276 printk(KERN_NOTICE "%s: "
1277 "unable to submit clear (%d)\n",
1279 ub_state_done(sc, cmd, rc);
1282 cmd->state = UB_CMDST_CLR2STS;
1283 ub_cmdtr_state(sc, cmd);
1286 if (urb->status == -EOVERFLOW) {
1288 * A babble? Failure, but we must transfer CSW now.
1290 cmd->error = -EOVERFLOW; /* A cheap trick... */
1291 ub_state_stat(sc, cmd);
1295 if (cmd->dir == UB_DIR_WRITE) {
1297 * Do not continue writes in case of a failure.
1298 * Doing so would cause sectors to be mixed up,
1299 * which is worse than sectors lost.
1301 * We must try to read the CSW, or many devices
1304 len = urb->actual_length;
1305 if (urb->status != 0 ||
1306 len != cmd->sgv[cmd->current_sg].length) {
1307 cmd->act_len += len;
1308 ub_cmdtr_act_len(sc, cmd);
1311 ub_state_stat(sc, cmd);
1317 * If an error occurs on read, we record it, and
1318 * continue to fetch data in order to avoid bubble.
1320 * As a small shortcut, we stop if we detect that
1321 * a CSW mixed into data.
1323 if (urb->status != 0)
1326 len = urb->actual_length;
1327 if (urb->status != 0 ||
1328 len != cmd->sgv[cmd->current_sg].length) {
1329 if ((len & 0x1FF) == US_BULK_CS_WRAP_LEN)
1334 cmd->act_len += urb->actual_length;
1335 ub_cmdtr_act_len(sc, cmd);
1337 if (++cmd->current_sg < cmd->nsg) {
1338 ub_data_start(sc, cmd);
1341 ub_state_stat(sc, cmd);
1343 } else if (cmd->state == UB_CMDST_STAT) {
1344 if (urb->status == -EPIPE) {
1345 rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe);
1347 printk(KERN_NOTICE "%s: "
1348 "unable to submit clear (%d)\n",
1350 ub_state_done(sc, cmd, rc);
1355 * Having a stall when getting CSW is an error, so
1356 * make sure uppper levels are not oblivious to it.
1358 cmd->error = -EIO; /* A cheap trick... */
1360 cmd->state = UB_CMDST_CLRRS;
1361 ub_cmdtr_state(sc, cmd);
1365 /* Catch everything, including -EOVERFLOW and other nasties. */
1366 if (urb->status != 0)
1369 if (urb->actual_length == 0) {
1370 ub_state_stat_counted(sc, cmd);
1375 * Check the returned Bulk protocol status.
1376 * The status block has to be validated first.
1379 bcs = &sc->work_bcs;
1381 if (sc->signature == cpu_to_le32(0)) {
1383 * This is the first reply, so do not perform the check.
1384 * Instead, remember the signature the device uses
1385 * for future checks. But do not allow a nul.
1387 sc->signature = bcs->Signature;
1388 if (sc->signature == cpu_to_le32(0)) {
1389 ub_state_stat_counted(sc, cmd);
1393 if (bcs->Signature != sc->signature) {
1394 ub_state_stat_counted(sc, cmd);
1399 if (bcs->Tag != cmd->tag) {
1401 * This usually happens when we disagree with the
1402 * device's microcode about something. For instance,
1403 * a few of them throw this after timeouts. They buffer
1404 * commands and reply at commands we timed out before.
1405 * Without flushing these replies we loop forever.
1407 ub_state_stat_counted(sc, cmd);
1411 len = le32_to_cpu(bcs->Residue);
1412 if (len != cmd->len - cmd->act_len) {
1414 * It is all right to transfer less, the caller has
1415 * to check. But it's not all right if the device
1416 * counts disagree with our counts.
1418 /* P3 */ printk("%s: resid %d len %d act %d\n",
1419 sc->name, len, cmd->len, cmd->act_len);
1423 switch (bcs->Status) {
1424 case US_BULK_STAT_OK:
1426 case US_BULK_STAT_FAIL:
1427 ub_state_sense(sc, cmd);
1429 case US_BULK_STAT_PHASE:
1430 /* P3 */ printk("%s: status PHASE\n", sc->name);
1433 printk(KERN_INFO "%s: unknown CSW status 0x%x\n",
1434 sc->name, bcs->Status);
1435 ub_state_done(sc, cmd, -EINVAL);
1439 /* Not zeroing error to preserve a babble indicator */
1440 if (cmd->error != 0) {
1441 ub_state_sense(sc, cmd);
1444 cmd->state = UB_CMDST_DONE;
1445 ub_cmdtr_state(sc, cmd);
1447 (*cmd->done)(sc, cmd);
1449 } else if (cmd->state == UB_CMDST_SENSE) {
1450 ub_state_done(sc, cmd, -EIO);
1453 printk(KERN_WARNING "%s: "
1454 "wrong command state %d\n",
1455 sc->name, cmd->state);
1456 ub_state_done(sc, cmd, -EINVAL);
1461 Bad_End: /* Little Excel is dead */
1462 ub_state_done(sc, cmd, -EIO);
1466 * Factorization helper for the command state machine:
1467 * Initiate a data segment transfer.
1469 static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
1471 struct scatterlist *sg = &cmd->sgv[cmd->current_sg];
1475 UB_INIT_COMPLETION(sc->work_done);
1477 if (cmd->dir == UB_DIR_READ)
1478 pipe = sc->recv_bulk_pipe;
1480 pipe = sc->send_bulk_pipe;
1481 sc->last_pipe = pipe;
1482 usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe,
1483 page_address(sg->page) + sg->offset, sg->length,
1484 ub_urb_complete, sc);
1485 sc->work_urb.actual_length = 0;
1486 sc->work_urb.error_count = 0;
1487 sc->work_urb.status = 0;
1489 if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) {
1490 /* XXX Clear stalls */
1491 ub_complete(&sc->work_done);
1492 ub_state_done(sc, cmd, rc);
1496 sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT;
1497 add_timer(&sc->work_timer);
1499 cmd->state = UB_CMDST_DATA;
1500 ub_cmdtr_state(sc, cmd);
1504 * Factorization helper for the command state machine:
1505 * Finish the command.
1507 static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc)
1511 cmd->state = UB_CMDST_DONE;
1512 ub_cmdtr_state(sc, cmd);
1514 (*cmd->done)(sc, cmd);
1518 * Factorization helper for the command state machine:
1519 * Submit a CSW read.
1521 static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
1525 UB_INIT_COMPLETION(sc->work_done);
1527 sc->last_pipe = sc->recv_bulk_pipe;
1528 usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->recv_bulk_pipe,
1529 &sc->work_bcs, US_BULK_CS_WRAP_LEN, ub_urb_complete, sc);
1530 sc->work_urb.actual_length = 0;
1531 sc->work_urb.error_count = 0;
1532 sc->work_urb.status = 0;
1534 if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) {
1535 /* XXX Clear stalls */
1536 ub_complete(&sc->work_done);
1537 ub_state_done(sc, cmd, rc);
1541 sc->work_timer.expires = jiffies + UB_STAT_TIMEOUT;
1542 add_timer(&sc->work_timer);
1547 * Factorization helper for the command state machine:
1548 * Submit a CSW read and go to STAT state.
1550 static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
1553 if (__ub_state_stat(sc, cmd) != 0)
1556 cmd->stat_count = 0;
1557 cmd->state = UB_CMDST_STAT;
1558 ub_cmdtr_state(sc, cmd);
1562 * Factorization helper for the command state machine:
1563 * Submit a CSW read and go to STAT state with counter (along [C] path).
1565 static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
1568 if (++cmd->stat_count >= 4) {
1569 ub_state_sense(sc, cmd);
1573 if (__ub_state_stat(sc, cmd) != 0)
1576 cmd->state = UB_CMDST_STAT;
1577 ub_cmdtr_state(sc, cmd);
1581 * Factorization helper for the command state machine:
1582 * Submit a REQUEST SENSE and go to SENSE state.
1584 static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
1586 struct ub_scsi_cmd *scmd;
1587 struct scatterlist *sg;
1590 if (cmd->cdb[0] == REQUEST_SENSE) {
1595 scmd = &sc->top_rqs_cmd;
1596 memset(scmd, 0, sizeof(struct ub_scsi_cmd));
1597 scmd->cdb[0] = REQUEST_SENSE;
1598 scmd->cdb[4] = UB_SENSE_SIZE;
1600 scmd->dir = UB_DIR_READ;
1601 scmd->state = UB_CMDST_INIT;
1604 sg->page = virt_to_page(sc->top_sense);
1605 sg->offset = (unsigned long)sc->top_sense & (PAGE_SIZE-1);
1606 sg->length = UB_SENSE_SIZE;
1607 scmd->len = UB_SENSE_SIZE;
1608 scmd->lun = cmd->lun;
1609 scmd->done = ub_top_sense_done;
1612 scmd->tag = sc->tagcnt++;
1614 cmd->state = UB_CMDST_SENSE;
1615 ub_cmdtr_state(sc, cmd);
1617 ub_cmdq_insert(sc, scmd);
1621 ub_state_done(sc, cmd, rc);
1625 * A helper for the command's state machine:
1626 * Submit a stall clear.
1628 static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
1632 struct usb_ctrlrequest *cr;
1635 endp = usb_pipeendpoint(stalled_pipe);
1636 if (usb_pipein (stalled_pipe))
1640 cr->bRequestType = USB_RECIP_ENDPOINT;
1641 cr->bRequest = USB_REQ_CLEAR_FEATURE;
1642 cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT);
1643 cr->wIndex = cpu_to_le16(endp);
1644 cr->wLength = cpu_to_le16(0);
1646 UB_INIT_COMPLETION(sc->work_done);
1648 usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe,
1649 (unsigned char*) cr, NULL, 0, ub_urb_complete, sc);
1650 sc->work_urb.actual_length = 0;
1651 sc->work_urb.error_count = 0;
1652 sc->work_urb.status = 0;
1654 if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) {
1655 ub_complete(&sc->work_done);
1659 sc->work_timer.expires = jiffies + UB_CTRL_TIMEOUT;
1660 add_timer(&sc->work_timer);
1666 static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd)
1668 unsigned char *sense = sc->top_sense;
1669 struct ub_scsi_cmd *cmd;
1672 * Ignoring scmd->act_len, because the buffer was pre-zeroed.
1674 ub_cmdtr_sense(sc, scmd, sense);
1677 * Find the command which triggered the unit attention or a check,
1678 * save the sense into it, and advance its state machine.
1680 if ((cmd = ub_cmdq_peek(sc)) == NULL) {
1681 printk(KERN_WARNING "%s: sense done while idle\n", sc->name);
1684 if (cmd != scmd->back) {
1685 printk(KERN_WARNING "%s: "
1686 "sense done for wrong command 0x%x\n",
1687 sc->name, cmd->tag);
1690 if (cmd->state != UB_CMDST_SENSE) {
1691 printk(KERN_WARNING "%s: "
1692 "sense done with bad cmd state %d\n",
1693 sc->name, cmd->state);
1697 cmd->key = sense[2] & 0x0F;
1698 cmd->asc = sense[12];
1699 cmd->ascq = sense[13];
1701 ub_scsi_urb_compl(sc, cmd);
1708 static void ub_reset_enter(struct ub_dev *sc)
1712 /* This happens often on multi-LUN devices. */
1717 #if 0 /* Not needed because the disconnect waits for us. */
1718 unsigned long flags;
1719 spin_lock_irqsave(&ub_lock, flags);
1721 spin_unlock_irqrestore(&ub_lock, flags);
1724 #if 0 /* We let them stop themselves. */
1725 struct list_head *p;
1727 list_for_each(p, &sc->luns) {
1728 lun = list_entry(p, struct ub_lun, link);
1729 blk_stop_queue(lun->disk->queue);
1733 schedule_work(&sc->reset_work);
1736 static void ub_reset_task(void *arg)
1738 struct ub_dev *sc = arg;
1739 unsigned long flags;
1740 struct list_head *p;
1745 printk(KERN_WARNING "%s: Running reset unrequested\n",
1750 if (atomic_read(&sc->poison)) {
1751 printk(KERN_NOTICE "%s: Not resetting disconnected device\n",
1752 sc->name); /* P3 This floods. Remove soon. XXX */
1753 } else if (sc->dev->actconfig->desc.bNumInterfaces != 1) {
1754 printk(KERN_NOTICE "%s: Not resetting multi-interface device\n",
1755 sc->name); /* P3 This floods. Remove soon. XXX */
1757 if ((lkr = usb_lock_device_for_reset(sc->dev, sc->intf)) < 0) {
1759 "%s: usb_lock_device_for_reset failed (%d)\n",
1762 rc = usb_reset_device(sc->dev);
1764 printk(KERN_NOTICE "%s: "
1765 "usb_lock_device_for_reset failed (%d)\n",
1770 usb_unlock_device(sc->dev);
1775 * In theory, no commands can be running while reset is active,
1776 * so nobody can ask for another reset, and so we do not need any
1777 * queues of resets or anything. We do need a spinlock though,
1778 * to interact with block layer.
1780 spin_lock_irqsave(sc->lock, flags);
1782 tasklet_schedule(&sc->tasklet);
1783 list_for_each(p, &sc->luns) {
1784 lun = list_entry(p, struct ub_lun, link);
1785 blk_start_queue(lun->disk->queue);
1787 wake_up(&sc->reset_wait);
1788 spin_unlock_irqrestore(sc->lock, flags);
1792 * This is called from a process context.
1794 static void ub_revalidate(struct ub_dev *sc, struct ub_lun *lun)
1797 lun->readonly = 0; /* XXX Query this from the device */
1799 lun->capacity.nsec = 0;
1800 lun->capacity.bsize = 512;
1801 lun->capacity.bshift = 0;
1803 if (ub_sync_tur(sc, lun) != 0)
1804 return; /* Not ready */
1807 if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) {
1809 * The retry here means something is wrong, either with the
1810 * device, with the transport, or with our code.
1811 * We keep this because sd.c has retries for capacity.
1813 if (ub_sync_read_cap(sc, lun, &lun->capacity) != 0) {
1814 lun->capacity.nsec = 0;
1815 lun->capacity.bsize = 512;
1816 lun->capacity.bshift = 0;
1823 * This is mostly needed to keep refcounting, but also to support
1824 * media checks on removable media drives.
1826 static int ub_bd_open(struct inode *inode, struct file *filp)
1828 struct gendisk *disk = inode->i_bdev->bd_disk;
1831 unsigned long flags;
1834 if ((lun = disk->private_data) == NULL)
1838 spin_lock_irqsave(&ub_lock, flags);
1839 if (atomic_read(&sc->poison)) {
1840 spin_unlock_irqrestore(&ub_lock, flags);
1844 spin_unlock_irqrestore(&ub_lock, flags);
1847 * This is a workaround for a specific problem in our block layer.
1848 * In 2.6.9, register_disk duplicates the code from rescan_partitions.
1849 * However, if we do add_disk with a device which persistently reports
1850 * a changed media, add_disk calls register_disk, which does do_open,
1851 * which will call rescan_paritions for changed media. After that,
1852 * register_disk attempts to do it all again and causes double kobject
1853 * registration and a eventually an oops on module removal.
1855 * The bottom line is, Al Viro says that we should not allow
1856 * bdev->bd_invalidated to be set when doing add_disk no matter what.
1858 if (lun->first_open) {
1859 lun->first_open = 0;
1866 if (lun->removable || lun->readonly)
1867 check_disk_change(inode->i_bdev);
1870 * The sd.c considers ->media_present and ->changed not equivalent,
1871 * under some pretty murky conditions (a failure of READ CAPACITY).
1872 * We may need it one day.
1874 if (lun->removable && lun->changed && !(filp->f_flags & O_NDELAY)) {
1879 if (lun->readonly && (filp->f_mode & FMODE_WRITE)) {
1893 static int ub_bd_release(struct inode *inode, struct file *filp)
1895 struct gendisk *disk = inode->i_bdev->bd_disk;
1896 struct ub_lun *lun = disk->private_data;
1897 struct ub_dev *sc = lun->udev;
1904 * The ioctl interface.
1906 static int ub_bd_ioctl(struct inode *inode, struct file *filp,
1907 unsigned int cmd, unsigned long arg)
1909 struct gendisk *disk = inode->i_bdev->bd_disk;
1910 void __user *usermem = (void __user *) arg;
1912 return scsi_cmd_ioctl(filp, disk, cmd, usermem);
1916 * This is called once a new disk was seen by the block layer or by ub_probe().
1917 * The main onjective here is to discover the features of the media such as
1918 * the capacity, read-only status, etc. USB storage generally does not
1919 * need to be spun up, but if we needed it, this would be the place.
1921 * This call can sleep.
1923 * The return code is not used.
1925 static int ub_bd_revalidate(struct gendisk *disk)
1927 struct ub_lun *lun = disk->private_data;
1929 ub_revalidate(lun->udev, lun);
1931 /* XXX Support sector size switching like in sr.c */
1932 blk_queue_hardsect_size(disk->queue, lun->capacity.bsize);
1933 set_capacity(disk, lun->capacity.nsec);
1934 // set_disk_ro(sdkp->disk, lun->readonly);
1940 * The check is called by the block layer to verify if the media
1941 * is still available. It is supposed to be harmless, lightweight and
1942 * non-intrusive in case the media was not changed.
1944 * This call can sleep.
1946 * The return code is bool!
1948 static int ub_bd_media_changed(struct gendisk *disk)
1950 struct ub_lun *lun = disk->private_data;
1952 if (!lun->removable)
1956 * We clean checks always after every command, so this is not
1957 * as dangerous as it looks. If the TEST_UNIT_READY fails here,
1958 * the device is actually not ready with operator or software
1959 * intervention required. One dangerous item might be a drive which
1960 * spins itself down, and come the time to write dirty pages, this
1961 * will fail, then block layer discards the data. Since we never
1962 * spin drives up, such devices simply cannot be used with ub anyway.
1964 if (ub_sync_tur(lun->udev, lun) != 0) {
1969 return lun->changed;
1972 static struct block_device_operations ub_bd_fops = {
1973 .owner = THIS_MODULE,
1975 .release = ub_bd_release,
1976 .ioctl = ub_bd_ioctl,
1977 .media_changed = ub_bd_media_changed,
1978 .revalidate_disk = ub_bd_revalidate,
1982 * Common ->done routine for commands executed synchronously.
1984 static void ub_probe_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
1986 struct completion *cop = cmd->back;
1991 * Test if the device has a check condition on it, synchronously.
1993 static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun)
1995 struct ub_scsi_cmd *cmd;
1996 enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) };
1997 unsigned long flags;
1998 struct completion compl;
2001 init_completion(&compl);
2004 if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL)
2006 memset(cmd, 0, ALLOC_SIZE);
2008 cmd->cdb[0] = TEST_UNIT_READY;
2010 cmd->dir = UB_DIR_NONE;
2011 cmd->state = UB_CMDST_INIT;
2012 cmd->lun = lun; /* This may be NULL, but that's ok */
2013 cmd->done = ub_probe_done;
2016 spin_lock_irqsave(sc->lock, flags);
2017 cmd->tag = sc->tagcnt++;
2019 rc = ub_submit_scsi(sc, cmd);
2020 spin_unlock_irqrestore(sc->lock, flags);
2023 printk("ub: testing ready: submit error (%d)\n", rc); /* P3 */
2027 wait_for_completion(&compl);
2031 if (rc == -EIO && cmd->key != 0) /* Retries for benh's key */
2041 * Read the SCSI capacity synchronously (for probing).
2043 static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun,
2044 struct ub_capacity *ret)
2046 struct ub_scsi_cmd *cmd;
2047 struct scatterlist *sg;
2049 enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) + 8 };
2050 unsigned long flags;
2051 unsigned int bsize, shift;
2053 struct completion compl;
2056 init_completion(&compl);
2059 if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL)
2061 memset(cmd, 0, ALLOC_SIZE);
2062 p = (char *)cmd + sizeof(struct ub_scsi_cmd);
2066 cmd->dir = UB_DIR_READ;
2067 cmd->state = UB_CMDST_INIT;
2070 sg->page = virt_to_page(p);
2071 sg->offset = (unsigned long)p & (PAGE_SIZE-1);
2075 cmd->done = ub_probe_done;
2078 spin_lock_irqsave(sc->lock, flags);
2079 cmd->tag = sc->tagcnt++;
2081 rc = ub_submit_scsi(sc, cmd);
2082 spin_unlock_irqrestore(sc->lock, flags);
2085 printk("ub: reading capacity: submit error (%d)\n", rc); /* P3 */
2089 wait_for_completion(&compl);
2091 if (cmd->error != 0) {
2092 printk("ub: reading capacity: error %d\n", cmd->error); /* P3 */
2096 if (cmd->act_len != 8) {
2097 printk("ub: reading capacity: size %d\n", cmd->act_len); /* P3 */
2102 /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */
2103 nsec = be32_to_cpu(*(__be32 *)p) + 1;
2104 bsize = be32_to_cpu(*(__be32 *)(p + 4));
2106 case 512: shift = 0; break;
2107 case 1024: shift = 1; break;
2108 case 2048: shift = 2; break;
2109 case 4096: shift = 3; break;
2111 printk("ub: Bad sector size %u\n", bsize); /* P3 */
2117 ret->bshift = shift;
2118 ret->nsec = nsec << shift;
2131 static void ub_probe_urb_complete(struct urb *urb, struct pt_regs *pt)
2133 struct completion *cop = urb->context;
2137 static void ub_probe_timeout(unsigned long arg)
2139 struct completion *cop = (struct completion *) arg;
2144 * Get number of LUNs by the way of Bulk GetMaxLUN command.
2146 static int ub_sync_getmaxlun(struct ub_dev *sc)
2148 int ifnum = sc->intf->cur_altsetting->desc.bInterfaceNumber;
2150 enum { ALLOC_SIZE = 1 };
2151 struct usb_ctrlrequest *cr;
2152 struct completion compl;
2153 struct timer_list timer;
2157 init_completion(&compl);
2160 if ((p = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL)
2165 cr->bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
2166 cr->bRequest = US_BULK_GET_MAX_LUN;
2167 cr->wValue = cpu_to_le16(0);
2168 cr->wIndex = cpu_to_le16(ifnum);
2169 cr->wLength = cpu_to_le16(1);
2171 usb_fill_control_urb(&sc->work_urb, sc->dev, sc->recv_ctrl_pipe,
2172 (unsigned char*) cr, p, 1, ub_probe_urb_complete, &compl);
2173 sc->work_urb.actual_length = 0;
2174 sc->work_urb.error_count = 0;
2175 sc->work_urb.status = 0;
2177 if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) {
2179 printk("%s: Stall submitting GetMaxLUN, using 1 LUN\n",
2183 "%s: Unable to submit GetMaxLUN (%d)\n",
2190 timer.function = ub_probe_timeout;
2191 timer.data = (unsigned long) &compl;
2192 timer.expires = jiffies + UB_CTRL_TIMEOUT;
2195 wait_for_completion(&compl);
2197 del_timer_sync(&timer);
2198 usb_kill_urb(&sc->work_urb);
2200 if ((rc = sc->work_urb.status) < 0) {
2202 printk("%s: Stall at GetMaxLUN, using 1 LUN\n",
2206 "%s: Error at GetMaxLUN (%d)\n",
2212 if (sc->work_urb.actual_length != 1) {
2213 printk("%s: GetMaxLUN returned %d bytes\n", sc->name,
2214 sc->work_urb.actual_length); /* P3 */
2217 if ((nluns = *p) == 55) {
2220 /* GetMaxLUN returns the maximum LUN number */
2222 if (nluns > UB_MAX_LUNS)
2223 nluns = UB_MAX_LUNS;
2225 printk("%s: GetMaxLUN returned %d, using %d LUNs\n", sc->name,
2226 *p, nluns); /* P3 */
2240 * Clear initial stalls.
2242 static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe)
2245 struct usb_ctrlrequest *cr;
2246 struct completion compl;
2247 struct timer_list timer;
2250 init_completion(&compl);
2252 endp = usb_pipeendpoint(stalled_pipe);
2253 if (usb_pipein (stalled_pipe))
2257 cr->bRequestType = USB_RECIP_ENDPOINT;
2258 cr->bRequest = USB_REQ_CLEAR_FEATURE;
2259 cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT);
2260 cr->wIndex = cpu_to_le16(endp);
2261 cr->wLength = cpu_to_le16(0);
2263 usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe,
2264 (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl);
2265 sc->work_urb.actual_length = 0;
2266 sc->work_urb.error_count = 0;
2267 sc->work_urb.status = 0;
2269 if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) {
2271 "%s: Unable to submit a probe clear (%d)\n", sc->name, rc);
2276 timer.function = ub_probe_timeout;
2277 timer.data = (unsigned long) &compl;
2278 timer.expires = jiffies + UB_CTRL_TIMEOUT;
2281 wait_for_completion(&compl);
2283 del_timer_sync(&timer);
2284 usb_kill_urb(&sc->work_urb);
2286 /* reset the endpoint toggle */
2287 usb_settoggle(sc->dev, endp, usb_pipeout(sc->last_pipe), 0);
2293 * Get the pipe settings.
2295 static int ub_get_pipes(struct ub_dev *sc, struct usb_device *dev,
2296 struct usb_interface *intf)
2298 struct usb_host_interface *altsetting = intf->cur_altsetting;
2299 struct usb_endpoint_descriptor *ep_in = NULL;
2300 struct usb_endpoint_descriptor *ep_out = NULL;
2301 struct usb_endpoint_descriptor *ep;
2305 * Find the endpoints we need.
2306 * We are expecting a minimum of 2 endpoints - in and out (bulk).
2307 * We will ignore any others.
2309 for (i = 0; i < altsetting->desc.bNumEndpoints; i++) {
2310 ep = &altsetting->endpoint[i].desc;
2312 /* Is it a BULK endpoint? */
2313 if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
2314 == USB_ENDPOINT_XFER_BULK) {
2315 /* BULK in or out? */
2316 if (ep->bEndpointAddress & USB_DIR_IN)
2323 if (ep_in == NULL || ep_out == NULL) {
2324 printk(KERN_NOTICE "%s: failed endpoint check\n",
2329 /* Calculate and store the pipe values */
2330 sc->send_ctrl_pipe = usb_sndctrlpipe(dev, 0);
2331 sc->recv_ctrl_pipe = usb_rcvctrlpipe(dev, 0);
2332 sc->send_bulk_pipe = usb_sndbulkpipe(dev,
2333 ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
2334 sc->recv_bulk_pipe = usb_rcvbulkpipe(dev,
2335 ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
2341 * Probing is done in the process context, which allows us to cheat
2342 * and not to build a state machine for the discovery.
2344 static int ub_probe(struct usb_interface *intf,
2345 const struct usb_device_id *dev_id)
2352 if (usb_usual_check_type(dev_id, USB_US_TYPE_UB))
2356 if ((sc = kmalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL)
2358 memset(sc, 0, sizeof(struct ub_dev));
2359 sc->lock = ub_next_lock();
2360 INIT_LIST_HEAD(&sc->luns);
2361 usb_init_urb(&sc->work_urb);
2362 tasklet_init(&sc->tasklet, ub_scsi_action, (unsigned long)sc);
2363 atomic_set(&sc->poison, 0);
2364 INIT_WORK(&sc->reset_work, ub_reset_task, sc);
2365 init_waitqueue_head(&sc->reset_wait);
2367 init_timer(&sc->work_timer);
2368 sc->work_timer.data = (unsigned long) sc;
2369 sc->work_timer.function = ub_urb_timeout;
2371 ub_init_completion(&sc->work_done);
2372 sc->work_done.done = 1; /* A little yuk, but oh well... */
2374 sc->dev = interface_to_usbdev(intf);
2376 // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2377 usb_set_intfdata(intf, sc);
2378 usb_get_dev(sc->dev);
2379 // usb_get_intf(sc->intf); /* Do we need this? */
2381 snprintf(sc->name, 12, DRV_NAME "(%d.%d)",
2382 sc->dev->bus->busnum, sc->dev->devnum);
2384 /* XXX Verify that we can handle the device (from descriptors) */
2386 if (ub_get_pipes(sc, sc->dev, intf) != 0)
2389 if (device_create_file(&sc->intf->dev, &dev_attr_diag) != 0)
2393 * At this point, all USB initialization is done, do upper layer.
2394 * We really hate halfway initialized structures, so from the
2395 * invariants perspective, this ub_dev is fully constructed at
2400 * This is needed to clear toggles. It is a problem only if we do
2401 * `rmmod ub && modprobe ub` without disconnects, but we like that.
2403 #if 0 /* iPod Mini fails if we do this (big white iPod works) */
2404 ub_probe_clear_stall(sc, sc->recv_bulk_pipe);
2405 ub_probe_clear_stall(sc, sc->send_bulk_pipe);
2409 * The way this is used by the startup code is a little specific.
2410 * A SCSI check causes a USB stall. Our common case code sees it
2411 * and clears the check, after which the device is ready for use.
2412 * But if a check was not present, any command other than
2413 * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE).
2415 * If we neglect to clear the SCSI check, the first real command fails
2416 * (which is the capacity readout). We clear that and retry, but why
2417 * causing spurious retries for no reason.
2419 * Revalidation may start with its own TEST_UNIT_READY, but that one
2420 * has to succeed, so we clear checks with an additional one here.
2421 * In any case it's not our business how revaliadation is implemented.
2423 for (i = 0; i < 3; i++) { /* Retries for benh's key */
2424 if ((rc = ub_sync_tur(sc, NULL)) <= 0) break;
2425 if (rc != 0x6) break;
2430 for (i = 0; i < 3; i++) {
2431 if ((rc = ub_sync_getmaxlun(sc)) < 0) {
2433 * This segment is taken from usb-storage. They say
2434 * that ZIP-100 needs this, but my own ZIP-100 works
2435 * fine without this.
2436 * Still, it does not seem to hurt anything.
2439 ub_probe_clear_stall(sc, sc->recv_bulk_pipe);
2440 ub_probe_clear_stall(sc, sc->send_bulk_pipe);
2451 for (i = 0; i < nluns; i++) {
2452 ub_probe_lun(sc, i);
2456 /* device_remove_file(&sc->intf->dev, &dev_attr_diag); */
2459 usb_set_intfdata(intf, NULL);
2460 // usb_put_intf(sc->intf);
2461 usb_put_dev(sc->dev);
2467 static int ub_probe_lun(struct ub_dev *sc, int lnum)
2471 struct gendisk *disk;
2475 if ((lun = kmalloc(sizeof(struct ub_lun), GFP_KERNEL)) == NULL)
2477 memset(lun, 0, sizeof(struct ub_lun));
2481 if ((lun->id = ub_id_get()) == -1)
2485 list_add(&lun->link, &sc->luns);
2487 snprintf(lun->name, 16, DRV_NAME "%c(%d.%d.%d)",
2488 lun->id + 'a', sc->dev->bus->busnum, sc->dev->devnum, lun->num);
2490 lun->removable = 1; /* XXX Query this from the device */
2491 lun->changed = 1; /* ub_revalidate clears only */
2492 lun->first_open = 1;
2493 ub_revalidate(sc, lun);
2496 if ((disk = alloc_disk(UB_PARTS_PER_LUN)) == NULL)
2500 sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a');
2501 sprintf(disk->devfs_name, DEVFS_NAME "/%c", lun->id + 'a');
2502 disk->major = UB_MAJOR;
2503 disk->first_minor = lun->id * UB_PARTS_PER_LUN;
2504 disk->fops = &ub_bd_fops;
2505 disk->private_data = lun;
2506 disk->driverfs_dev = &sc->intf->dev;
2509 if ((q = blk_init_queue(ub_request_fn, sc->lock)) == NULL)
2514 blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);
2515 blk_queue_max_hw_segments(q, UB_MAX_REQ_SG);
2516 blk_queue_max_phys_segments(q, UB_MAX_REQ_SG);
2517 blk_queue_segment_boundary(q, 0xffffffff); /* Dubious. */
2518 blk_queue_max_sectors(q, UB_MAX_SECTORS);
2519 blk_queue_hardsect_size(q, lun->capacity.bsize);
2523 set_capacity(disk, lun->capacity.nsec);
2525 disk->flags |= GENHD_FL_REMOVABLE;
2534 list_del(&lun->link);
2542 static void ub_disconnect(struct usb_interface *intf)
2544 struct ub_dev *sc = usb_get_intfdata(intf);
2545 struct list_head *p;
2547 struct gendisk *disk;
2548 unsigned long flags;
2551 * Prevent ub_bd_release from pulling the rug from under us.
2552 * XXX This is starting to look like a kref.
2553 * XXX Why not to take this ref at probe time?
2555 spin_lock_irqsave(&ub_lock, flags);
2557 spin_unlock_irqrestore(&ub_lock, flags);
2560 * Fence stall clearnings, operations triggered by unlinkings and so on.
2561 * We do not attempt to unlink any URBs, because we do not trust the
2562 * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway.
2564 atomic_set(&sc->poison, 1);
2567 * Wait for reset to end, if any.
2569 wait_event(sc->reset_wait, !sc->reset);
2572 * Blow away queued commands.
2574 * Actually, this never works, because before we get here
2575 * the HCD terminates outstanding URB(s). It causes our
2576 * SCSI command queue to advance, commands fail to submit,
2577 * and the whole queue drains. So, we just use this code to
2580 spin_lock_irqsave(sc->lock, flags);
2582 struct ub_scsi_cmd *cmd;
2584 while ((cmd = ub_cmdq_peek(sc)) != NULL) {
2585 cmd->error = -ENOTCONN;
2586 cmd->state = UB_CMDST_DONE;
2587 ub_cmdtr_state(sc, cmd);
2589 (*cmd->done)(sc, cmd);
2593 printk(KERN_WARNING "%s: "
2594 "%d was queued after shutdown\n", sc->name, cnt);
2597 spin_unlock_irqrestore(sc->lock, flags);
2600 * Unregister the upper layer.
2602 list_for_each (p, &sc->luns) {
2603 lun = list_entry(p, struct ub_lun, link);
2605 if (disk->flags & GENHD_FL_UP)
2608 * I wish I could do:
2609 * set_bit(QUEUE_FLAG_DEAD, &q->queue_flags);
2610 * As it is, we rely on our internal poisoning and let
2611 * the upper levels to spin furiously failing all the I/O.
2616 * Testing for -EINPROGRESS is always a bug, so we are bending
2617 * the rules a little.
2619 spin_lock_irqsave(sc->lock, flags);
2620 if (sc->work_urb.status == -EINPROGRESS) { /* janitors: ignore */
2621 printk(KERN_WARNING "%s: "
2622 "URB is active after disconnect\n", sc->name);
2624 spin_unlock_irqrestore(sc->lock, flags);
2627 * There is virtually no chance that other CPU runs times so long
2628 * after ub_urb_complete should have called del_timer, but only if HCD
2629 * didn't forget to deliver a callback on unlink.
2631 del_timer_sync(&sc->work_timer);
2634 * At this point there must be no commands coming from anyone
2635 * and no URBs left in transit.
2638 device_remove_file(&sc->intf->dev, &dev_attr_diag);
2639 usb_set_intfdata(intf, NULL);
2640 // usb_put_intf(sc->intf);
2642 usb_put_dev(sc->dev);
2648 static struct usb_driver ub_driver = {
2651 .disconnect = ub_disconnect,
2652 .id_table = ub_usb_ids,
2655 static int __init ub_init(void)
2660 for (i = 0; i < UB_QLOCK_NUM; i++)
2661 spin_lock_init(&ub_qlockv[i]);
2663 if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0)
2665 devfs_mk_dir(DEVFS_NAME);
2667 if ((rc = usb_register(&ub_driver)) != 0)
2670 usb_usual_set_present(USB_US_TYPE_UB);
2674 devfs_remove(DEVFS_NAME);
2675 unregister_blkdev(UB_MAJOR, DRV_NAME);
2680 static void __exit ub_exit(void)
2682 usb_deregister(&ub_driver);
2684 devfs_remove(DEVFS_NAME);
2685 unregister_blkdev(UB_MAJOR, DRV_NAME);
2686 usb_usual_clear_present(USB_US_TYPE_UB);
2689 module_init(ub_init);
2690 module_exit(ub_exit);
2692 MODULE_LICENSE("GPL");